21. In a Laser (say neon laser) all the atoms emit the light waves of
22. The Laser is a beam of radiations which are
23. In quantum mechanics a particle is represented by a
24. The p wave of a normal Electrocardiogram indicates
25. Which of the following phenomenon helps to conclude that light is a transverse wave?
26. What is the phenomenon which established the transverse nature of light ?
27. Golden view of sea shell is due to
28. The light of distant stars is affected by
29. A soap bubble shows colours when illuminated with white light. This is due to
30. Which of the following waves cannot be polarised?
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